1 #ifndef _LINUX_HUGETLB_H 2 #define _LINUX_HUGETLB_H 3 4 #include <linux/fs.h> 5 6 struct ctl_table; 7 struct user_struct; 8 9 #ifdef CONFIG_HUGETLB_PAGE 10 11 #include <linux/mempolicy.h> 12 #include <linux/shm.h> 13 #include <asm/tlbflush.h> 14 15 int PageHuge(struct page *page); 16 17 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma) 18 { 19 return vma->vm_flags & VM_HUGETLB; 20 } 21 22 void reset_vma_resv_huge_pages(struct vm_area_struct *vma); 23 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 24 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 25 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 26 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *); 27 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, 28 struct page **, struct vm_area_struct **, 29 unsigned long *, int *, int, unsigned int flags); 30 void unmap_hugepage_range(struct vm_area_struct *, 31 unsigned long, unsigned long, struct page *); 32 void __unmap_hugepage_range(struct vm_area_struct *, 33 unsigned long, unsigned long, struct page *); 34 int hugetlb_prefault(struct address_space *, struct vm_area_struct *); 35 void hugetlb_report_meminfo(struct seq_file *); 36 int hugetlb_report_node_meminfo(int, char *); 37 unsigned long hugetlb_total_pages(void); 38 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, 39 unsigned long address, unsigned int flags); 40 int hugetlb_reserve_pages(struct inode *inode, long from, long to, 41 struct vm_area_struct *vma, 42 int acctflags); 43 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed); 44 45 extern unsigned long hugepages_treat_as_movable; 46 extern const unsigned long hugetlb_zero, hugetlb_infinity; 47 extern int sysctl_hugetlb_shm_group; 48 extern struct list_head huge_boot_pages; 49 50 /* arch callbacks */ 51 52 pte_t *huge_pte_alloc(struct mm_struct *mm, 53 unsigned long addr, unsigned long sz); 54 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr); 55 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep); 56 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address, 57 int write); 58 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, 59 pmd_t *pmd, int write); 60 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address, 61 pud_t *pud, int write); 62 int pmd_huge(pmd_t pmd); 63 int pud_huge(pud_t pmd); 64 void hugetlb_change_protection(struct vm_area_struct *vma, 65 unsigned long address, unsigned long end, pgprot_t newprot); 66 67 #else /* !CONFIG_HUGETLB_PAGE */ 68 69 static inline int PageHuge(struct page *page) 70 { 71 return 0; 72 } 73 74 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma) 75 { 76 return 0; 77 } 78 79 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma) 80 { 81 } 82 83 static inline unsigned long hugetlb_total_pages(void) 84 { 85 return 0; 86 } 87 88 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; }) 89 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL) 90 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; }) 91 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; }) 92 #define unmap_hugepage_range(vma, start, end, page) BUG() 93 static inline void hugetlb_report_meminfo(struct seq_file *m) 94 { 95 } 96 #define hugetlb_report_node_meminfo(n, buf) 0 97 #define follow_huge_pmd(mm, addr, pmd, write) NULL 98 #define follow_huge_pud(mm, addr, pud, write) NULL 99 #define prepare_hugepage_range(file, addr, len) (-EINVAL) 100 #define pmd_huge(x) 0 101 #define pud_huge(x) 0 102 #define is_hugepage_only_range(mm, addr, len) 0 103 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; }) 104 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; }) 105 106 #define hugetlb_change_protection(vma, address, end, newprot) 107 108 #ifndef HPAGE_MASK 109 #define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */ 110 #define HPAGE_SIZE PAGE_SIZE 111 #endif 112 113 #endif /* !CONFIG_HUGETLB_PAGE */ 114 115 #define HUGETLB_ANON_FILE "anon_hugepage" 116 117 enum { 118 /* 119 * The file will be used as an shm file so shmfs accounting rules 120 * apply 121 */ 122 HUGETLB_SHMFS_INODE = 1, 123 /* 124 * The file is being created on the internal vfs mount and shmfs 125 * accounting rules do not apply 126 */ 127 HUGETLB_ANONHUGE_INODE = 2, 128 }; 129 130 #ifdef CONFIG_HUGETLBFS 131 struct hugetlbfs_config { 132 uid_t uid; 133 gid_t gid; 134 umode_t mode; 135 long nr_blocks; 136 long nr_inodes; 137 struct hstate *hstate; 138 }; 139 140 struct hugetlbfs_sb_info { 141 long max_blocks; /* blocks allowed */ 142 long free_blocks; /* blocks free */ 143 long max_inodes; /* inodes allowed */ 144 long free_inodes; /* inodes free */ 145 spinlock_t stat_lock; 146 struct hstate *hstate; 147 }; 148 149 150 struct hugetlbfs_inode_info { 151 struct shared_policy policy; 152 struct inode vfs_inode; 153 }; 154 155 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode) 156 { 157 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode); 158 } 159 160 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb) 161 { 162 return sb->s_fs_info; 163 } 164 165 extern const struct file_operations hugetlbfs_file_operations; 166 extern const struct vm_operations_struct hugetlb_vm_ops; 167 struct file *hugetlb_file_setup(const char *name, size_t size, int acct, 168 struct user_struct **user, int creat_flags); 169 int hugetlb_get_quota(struct address_space *mapping, long delta); 170 void hugetlb_put_quota(struct address_space *mapping, long delta); 171 172 static inline int is_file_hugepages(struct file *file) 173 { 174 if (file->f_op == &hugetlbfs_file_operations) 175 return 1; 176 if (is_file_shm_hugepages(file)) 177 return 1; 178 179 return 0; 180 } 181 182 static inline void set_file_hugepages(struct file *file) 183 { 184 file->f_op = &hugetlbfs_file_operations; 185 } 186 #else /* !CONFIG_HUGETLBFS */ 187 188 #define is_file_hugepages(file) 0 189 #define set_file_hugepages(file) BUG() 190 static inline struct file *hugetlb_file_setup(const char *name, size_t size, 191 int acctflag, struct user_struct **user, int creat_flags) 192 { 193 return ERR_PTR(-ENOSYS); 194 } 195 196 #endif /* !CONFIG_HUGETLBFS */ 197 198 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA 199 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, 200 unsigned long len, unsigned long pgoff, 201 unsigned long flags); 202 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */ 203 204 #ifdef CONFIG_HUGETLB_PAGE 205 206 #define HSTATE_NAME_LEN 32 207 /* Defines one hugetlb page size */ 208 struct hstate { 209 int next_nid_to_alloc; 210 int next_nid_to_free; 211 unsigned int order; 212 unsigned long mask; 213 unsigned long max_huge_pages; 214 unsigned long nr_huge_pages; 215 unsigned long free_huge_pages; 216 unsigned long resv_huge_pages; 217 unsigned long surplus_huge_pages; 218 unsigned long nr_overcommit_huge_pages; 219 struct list_head hugepage_freelists[MAX_NUMNODES]; 220 unsigned int nr_huge_pages_node[MAX_NUMNODES]; 221 unsigned int free_huge_pages_node[MAX_NUMNODES]; 222 unsigned int surplus_huge_pages_node[MAX_NUMNODES]; 223 char name[HSTATE_NAME_LEN]; 224 }; 225 226 struct huge_bootmem_page { 227 struct list_head list; 228 struct hstate *hstate; 229 }; 230 231 /* arch callback */ 232 int __init alloc_bootmem_huge_page(struct hstate *h); 233 234 void __init hugetlb_add_hstate(unsigned order); 235 struct hstate *size_to_hstate(unsigned long size); 236 237 #ifndef HUGE_MAX_HSTATE 238 #define HUGE_MAX_HSTATE 1 239 #endif 240 241 extern struct hstate hstates[HUGE_MAX_HSTATE]; 242 extern unsigned int default_hstate_idx; 243 244 #define default_hstate (hstates[default_hstate_idx]) 245 246 static inline struct hstate *hstate_inode(struct inode *i) 247 { 248 struct hugetlbfs_sb_info *hsb; 249 hsb = HUGETLBFS_SB(i->i_sb); 250 return hsb->hstate; 251 } 252 253 static inline struct hstate *hstate_file(struct file *f) 254 { 255 return hstate_inode(f->f_dentry->d_inode); 256 } 257 258 static inline struct hstate *hstate_vma(struct vm_area_struct *vma) 259 { 260 return hstate_file(vma->vm_file); 261 } 262 263 static inline unsigned long huge_page_size(struct hstate *h) 264 { 265 return (unsigned long)PAGE_SIZE << h->order; 266 } 267 268 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma); 269 270 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma); 271 272 static inline unsigned long huge_page_mask(struct hstate *h) 273 { 274 return h->mask; 275 } 276 277 static inline unsigned int huge_page_order(struct hstate *h) 278 { 279 return h->order; 280 } 281 282 static inline unsigned huge_page_shift(struct hstate *h) 283 { 284 return h->order + PAGE_SHIFT; 285 } 286 287 static inline unsigned int pages_per_huge_page(struct hstate *h) 288 { 289 return 1 << h->order; 290 } 291 292 static inline unsigned int blocks_per_huge_page(struct hstate *h) 293 { 294 return huge_page_size(h) / 512; 295 } 296 297 #include <asm/hugetlb.h> 298 299 static inline struct hstate *page_hstate(struct page *page) 300 { 301 return size_to_hstate(PAGE_SIZE << compound_order(page)); 302 } 303 304 #else 305 struct hstate {}; 306 #define alloc_bootmem_huge_page(h) NULL 307 #define hstate_file(f) NULL 308 #define hstate_vma(v) NULL 309 #define hstate_inode(i) NULL 310 #define huge_page_size(h) PAGE_SIZE 311 #define huge_page_mask(h) PAGE_MASK 312 #define vma_kernel_pagesize(v) PAGE_SIZE 313 #define vma_mmu_pagesize(v) PAGE_SIZE 314 #define huge_page_order(h) 0 315 #define huge_page_shift(h) PAGE_SHIFT 316 static inline unsigned int pages_per_huge_page(struct hstate *h) 317 { 318 return 1; 319 } 320 #endif 321 322 #endif /* _LINUX_HUGETLB_H */ 323